Or you might better think, not enough located in London to your liking...

20 Fenchurch street is in London, and it is pretty much hated unanimously. If THAT had been proposed for Paris and Londoners said they hated it, then you would say it was because it was not proposed in London. The same for Beetham tower(which was 220m), and Doon Street Tower.

but , why are nearly all the new LD buildings (exept Granite) built on the right side of the Grande Axe ??

That's just random. There's a 180 meters designed by Viguier which will be built near Ariane on the southern side. The Ministry of Public Works should also be above 200 meters on the southern side.

Actually, the Morphosis tower is built on the municipality of Puteaux, so there's absolutely no administrative barrier to build taller on the southern side.

As the Northern circular boulevard has been already re-designed, I guess it's easier to market towers nearby it. The southern circular boulevard will be re-designed later, and I guess taller towers will come then.